Fitting for post insulators



March '3, 1942. 2 J. J. TAYLOR 2,275,207

FITTING FOR POST INSULATORS Filed May 3, 1940 INVENTOR John (1 Tag/or ATTORN EY Patented Mar. 3, 1942 FITTING FOR POST INSULATORS John J. Taylor, Wadsworth, Ohio, assignor to The Ohio Brass Company, Mansfield, Ohio, a corporation of New Jersey Application May 3, 1940, Serial No. 333,125

7 Claims.

This invention relates to fittings for post insulators and has for one of its objects the provision of a fitting that will equip a post insulator to which it is attached for substantially all conditions under which post insulators are used.

Another object of the invention is to provide an insulator fitting which shall be economical to manufacture and easy to install.

A further object of the invention is to provide insulator fittings of improved construction and operation.

Other objects and advantages will appear from the following specification.

The invention is exemplified by the combination and arrangement of parts shown in the accompanying drawing and described in the following specification, and it is more particularly pointed out in the appended claims.

In the drawing Fig. 1 is a top plan view of an insulator having a fitting made according to one form of the present invention applied thereto.

Fig. 2 is a fragmentary elevation partly in section showing two post insulators connected together by fittings like that shown in Fig. 1.

Fig. 3 is a top plan view of an insulator cap showing a somewhat modified form of the invention.

Fig. 4 is a vertical sectional view of two caps connected together, the section being taken on line 4-4 of Fig. 3.

Fig. 5 is a view similar to Fig. 3 but having a different form of connector block applied thereto.

Fig. 6 is a fragmentary elevation looking from the right in Fig. 5.

Heretofore post insulators have usually been equipped either with a cap having tapped holes therein for attachment to suporting members or with slots for receiving the heads of bolts for connecting the insulator with the supporting members or with the load. Where an insulator is equipped with one or the other of these forms of fittings it has been necessary to use that insulator with a support adapted for the particular fitting with which the insulator is equipped. The present invention provides for post fitting which may be connected with the supports designed either for slotted or tapped insulator caps and further provides means for connecting together the caps of difierent insulators so that a. plurality of post insulators may be secured together one upon the other in a stack.

The stacking of post insulators has heretofore been impossible because, if the fittings have tapped holes there is no way to thread the connecting bolts into the holes of adjacent fittings and if the fittings are provided with slotted openings it is not possible to thread the bolts and nuts together so as to hold adjacent fittings together.

In many cases, for high voltages, it is very desirable to connect a plurality of post insulators together in a stack and the present invention makes it possible to do so using the same fittings as are used when the posts are separately installed.

In the form of the invention shown in Figs. 1 and 2 the numerals l0 and II designate two post insulators respectively connected to each other by caps or fittings 12. Each of these fittings is secured to its insulator by cement l3. Each cap is provided with four dove-tailed slots I4, leaving upstanding bosses I 5 with overhanging ledges l6 interposed between the slots.

When it is desired to connect two caps together as shown in Fig. 2, a suitable connector block I! is inserted in registering slots in the connected caps. Each of these blocks is provided with clamping grooves at its sides for receiving the registering ledges l6 of adjacent caps. The clamping blocks are held in place by bolts IS, the heads IQ of which bear against the inner faces of the cooperating bosses I5. The connecting blocks I! are pressed tightly into place by a nut 20 on the outer end of the bolt I8. The bolt of course, passes through a perforation in the connector block.

Since the slots are tapered inwardly the connector blocks will all be wedged tightly into their respective slots. Only one of these blocks is shown in place in Fig. 1, but it will be understood that four blocks will be used, one for each pair of registering slots. The caps may be provided with central bosses 2| to provide additional bearing surface for the adjacent caps.

By means of the connector block I! insulators provided with this form of fitting may be readily connected to other insulators similarly equipped, or to supports having connecting slots similar to those of the fittings.

In order that the same fittings may be used in connection with supports having perforated flanges or plates, the caps l2, in addition to the slots described, are also provided with tapped holes 22 into which cap screws may be threaded for securing the insulators to base or load supports in a manner well known in the art.

In the form of the invention shown in Figs. 3, 4, 5 and 6 the caps 23 are provided with slots 24 having overhanging ledges 25 at each side thereof and connector blocks 26 are held in place in these slots by cap screws 27 which are threaded into a retainer ring 28 disposed in the space surrounded by the bosses 29 and slots 24. Since the slots are tapered inwardly the connector blocks will be wedged tightly in their respective slots and hold the caps firmly together.

Instead of using the double form of connector blocks shown at 26 in Figs. 3 and 4 a single form of block 30, having a tapped opening 3|, may be disposed in each of the slots 24 as shown in Figs. 5 and 6. This makes it possible to connect the cap with perforated plates or flanges by extending cap screws through the perforations and threading them into the openings 3| in the blocks 39. In this way the insulators may be equipped at the factory with caps similar to those shown in Figs. 3, 4 and 5 and when it is desired to connect one of these caps to a given support or to another insulator it is only necessary to select the form of block suitable for the particular member with which the cap is to be connected.

It will thus be seen that the invention makes it possible to use the same insulators for a large variety of supports or loads thus avoiding the necessity of maintaining a stock of insulators provided with various forms of fittings.

I claim:

1. An insulator cap having a support engaging face provided with a slot with side walls converging longitudinally of said slot, a connector member disposed in said slot and threaded means for moving said connector member longitudinally of said slot to wedge said connector member in said slot.

2, An insulator having a slotted cap, the slot in said cap opening at one side thereof through one surface of said cap and being wider at its base than at its open side, the side walls of said slot being convergent longitudinally of said slot, a connector disposed in said slot and having a head portion conforming to the cross sectional contour of said slot, and a threaded member for pressing said connector toward the converging end of said slot.

3. In combination a pair of insulators, and means for securing said insulators rigidly together, said means comprising a pair of fittings disposed. face to face and being secured, one to each insulator respectively, said fittings having registering dove tail grooves with longitudinally converging sides, a connector having joined heads, one disposed in each of said registering grooves and threaded means for pressing said connector toward the end of said groove toward which said sides converge.

4. An insulator having a fitting secured thereto, said fitting having radially disposed dovetail grooves therein, said grooves being tapered inwardly toward the axis of said insulator and connector blocks disposed in said grooves and shaped to conform to the shape of said grooves so that said blocks will be wedged tightly in said grooves when moved radially therein toward the axis of said insulator.

5. An insulator having a fitting secured thereto, said fitting having radially disposed dovetail grooves therein, said grooves being tapered inwardly toward the axis of said insulator and connector blocks disposed in said grooves and shaped to conform to the shape of said grooves so that said blocks will be wedged tightly in said grooves when moved radially therein toward the axis of said insulator and threaded means for moving said blocks in said grooves.

6. An insulator stack comprising a plurality of insulator units superimposed one upon the other and connected together, adjacent ends of said units being equipped with fittings having dovetail registering radial grooves therein, said grooves being tapered inwardly toward the axis of said insulator, connector blocks having enlargements at opposite sides thereof disposed in registering grooves in adjacent fittings of connected insulators, said enlargements being joined by reduced portions of said blocks and being shaped to conform to the shape of said grooves so that when said blocks are moved in said grooves toward the axis of said insulator they will wedge tightly in said grooves and threaded means for moving said blocks toward the axis of said insulator to tighten said blocks in said grooves and secure said insulator units together in said stack.

7. An insulator stack comprising a plurality of insulator units superimposed one upon the other and connected together, adjacent ends of said units in a stack being equipped with fittings having dovetail registering radial grooves therein, said grooves being tapered inwardly toward the axis of said insulator stack, connector blocks having enlargements at opposite sides thereof disposed in registering grooves in adjacent fittings in said stack, said enlargements being joined by reduced portions of said blocks and being shaped to conform to the shape of said grooves so that when said blocks are moved along said grooves toward the axis of said insulator stack said enlargements will wedge tightly in said grooves, and threaded means for moving said blocks toward the axis of said insulator stack to tighten said blocks in said grooves and secure said insulator units in a stack, said fittings having threaded openings for connecting the endmost fitting in said stack with a load or a support.

JOHN J. TAYLOR. 

